IEEE80211(9) NetBSD Kernel Developer's Manual IEEE80211(9)
NAMEieee80211_ifattach, ieee80211_ifdetach, ieee80211_mhz2ieee,
ieee80211_chan2ieee, ieee80211_ieee2mhz, ieee80211_media_init,
ieee80211_media_change, ieee80211_media_status, ieee80211_watchdog,
ieee80211_setmode, ieee80211_chan2mode, ieee80211_rate2media,
ieee80211_media2rate -- core 802.11 network stack functions
SYNOPSIS#include <net80211/ieee80211_var.h>#include <net80211/ieee80211_proto.h>voidieee80211_ifattach(struct ieee80211com *ic);
voidieee80211_ifdetach(struct ieee80211com *ic);
u_intieee80211_mhz2ieee(u_int freq, u_int flags);
u_intieee80211_chan2ieee(struct ieee80211com *ic,
struct ieee80211_channel *c);
u_intieee80211_ieee2mhz(u_int chan, u_int flags);
voidieee80211_media_init(struct ieee80211com *ic,
ifm_change_cb_t media_change, ifm_stat_cb_t media_stat);
intieee80211_media_change(struct ifnet *ifp);
voidieee80211_media_status(struct ifnet *ifp, struct ifmediareq *imr);
voidieee80211_watchdog(struct ieee80211com *ic);
intieee80211_setmode(struct ieee80211com *ic, enum ieee80211_phymode mode);
enum ieee80211_phymodeieee80211_chan2mode(struct ieee80211com *ic,
struct ieee80211_channel *chan);
intieee80211_rate2media(struct ieee80211com *ic, int rate,
enum ieee80211_phymode mode);
intieee80211_media2rate(int mword);
DESCRIPTION
The ieee80211 collection of functions are used to manage wireless network
interfaces in the system which use the system's software 802.11 network
stack. Most of these functions require that attachment to the stack is
performed before calling. Several utility functions are also provided;
these are safe to call from any driver without prior initialization.
The ieee80211_ifattach() function attaches the wireless network interface
ic to the 802.11 network stack layer. This function must be called
before using any of the ieee80211 functions which need to store driver
state across invocations. This function also performs Ethernet and BPF
attachment (by calling ether_ifattach() and bpfattach2()) on behalf of
the caller.
The ieee80211_ifdetach() function frees any ieee80211 structures associ-
ated with the driver, and performs Ethernet and BPF detachment on behalf
of the caller.
The ieee80211_mhz2ieee() utility function converts the frequency freq
(specified in MHz) to an IEEE 802.11 channel number. The flags argument
is a hint which specifies whether the frequency is in the 2GHz ISM band
(IEEE80211_CHAN_2GHZ) or the 5GHz band (IEEE80211_CHAN_5GHZ); appropriate
clipping of the result is then performed.
The ieee80211_chan2ieee() function converts the channel specified in *c
to an IEEE channel number for the driver ic. If the conversion would be
invalid, an error message is printed to the system console. This func-
tion REQUIRES that the driver is hooked up to the ieee80211 subsystem.
The ieee80211_ieee2mhz() utility function converts the IEEE channel num-
ber chan to a frequency (in MHz). The flags argument is a hint which
specifies whether the frequency is in the 2GHz ISM band
(IEEE80211_CHAN_2GHZ) or the 5GHz band (IEEE80211_CHAN_5GHZ); appropriate
clipping of the result is then performed.
The ieee80211_media_init() function initializes media data structures
used by the ifmedia interface for the driver ic. It must be called by
the driver after calling ieee80211_ifattach() and before calling most
ieee80211 functions. The media_change and media_stat arguments specify
helper functions which will be invoked by the ifmedia framework when the
user changes or queries media options, using a command such as
ifconfig(8).
The ieee80211_media_status() and ieee80211_media_change() functions are
device-independent handlers for ifmedia commands and are not intended to
be called directly.
The ieee80211_watchdog() function is intended to be called from a
driver's if_watchdog routine. It is used to perform periodic cleanup of
state within the software 802.11 stack, as well as timing out scans.
The ieee80211_setmode() function is called from within the 802.11 stack
to change the mode of the driver's PHY; it is not intended to be called
directly.
The ieee80211_chan2mode() function returns the PHY mode required for use
with the channel chan on the device ic. This is typically used when
selecting a rate set, to be advertised in beacons, for example.
The ieee80211_rate2media() function converts the bit rate rate (measured
in units of 0.5Mbps) to an ifmedia sub-type, for the device ic running in
PHY mode mode. The ieee80211_media2rate() performs the reverse of this
conversion, returning the bit rate (in 0.5Mbps units) corresponding to an
ifmedia sub-type.
SEE ALSOieee80211_crypto(9), ieee80211_input(9), ieee80211_ioctl(9),
ieee80211_node(9), ieee80211_output(9), ieee80211_proto(9),
ieee80211_radiotap(9)HISTORY
The ieee80211 series of functions first appeared in NetBSD 1.5, and were
later ported to FreeBSD 4.6.
AUTHORS
This man page was written by Bruce M. Simpson <bms@FreeBSD.org> and
Darron Broad <darron@kewl.org>.
NetBSD 8.0 September 12, 2006 NetBSD 8.0

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